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Employee Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2014
Employee Benefit Plans [Abstract]  
Components Of Net Periodic Benefit Expense
    Three months ended  
    March 31,    
    2014     2013  
Service cost $ 479   $ 516  
Interest cost on projected benefit obligation   574     505  
Expected return on plan assets   (1,029 )   (921 )
Amortization of prior service credit   (12 )   (12 )
Amortization of net actuarial losses   44     341  
Net periodic pension expense $ 56   $ 429